perf stat: Use perf_evlist__enable in handle_initial_delay

No need to mimic the behaviour of perf_evlist__enable, we can use it
directly.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1449133606-14429-5-git-send-email-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-stat.c

@@ -253,12 +253,9 @@ static void process_interval(void)
 
 static void handle_initial_delay(void)
 {
-	struct perf_evsel *counter;
-
 	if (initial_delay) {
 		usleep(initial_delay * 1000);
-		evlist__for_each(evsel_list, counter)
-			perf_evsel__enable(counter);
+		perf_evlist__enable(evsel_list);
 	}
 }